Of or pertaining to a single family or stock, or to development from a single common parent form; -- opposed to polyphyletic; as, monophyletic origin.

Sharing a common ancestor.

Term applied to a group of organisms which includes the most recent common ancestor of all of its members and all of the descendants of that most recent common ancestor. A monophyletic group is called a clade.

(mon´ oh fih leht´ ik) [Gk. monos: single + phylon: tribe] • Being descended from a single ancestral stock.